Authors:
Sasan Amirabdollahian (University of Trento, Italy),
Maryam Eslami (Ohio University, USA),
Matteo Perini (ProM Facility of Trentino Sviluppo, Italy),
Alberto Molinari (University of Trento, Italy)
Abstract:
Laser-directed energy deposition (L-DED) is one of the most practiced additive manufacturing (AM) methods that provide opportunities for the production of parts as well as repair and cladding. AISI 415 Martensitic stainless steel demonstrates high mechanical properties, excellent toughness, and weldability with a wide range of applications. In the current work, crack-free and full-dense parts were deposited after developing proper processing parameters. As-built (AB) microstructure comprised lath martensite with a microhardness of 400HV. The effect of two different heat treatment scenarios of direct tempering of the as-built part (DT) and austenitization and quenching prior to tempering (QT) on the microstructure and hardness were investigated. The tempering curves for the two scenarios were similar, demonstrating a hardening peak at 450°C, while DT samples possessed slightly higher hardness due to the finer martensite substructure. Polarization tests revealed AM sample demonstrates 110 mV higher pitting potential compared to the conventional.
DOI:
https://doi.org/10.59499/WP225372183